Context Sensitive Help
Context-sensitive help links provide content based on the context of what the user is doing. In many cases, this help content is based on the window that is open and active. For example, the Help button on a window in a software product can open a specific help topic that provides important information about the window:
What the window allows you to do
Brief concepts needed to understand the window
Guidance for how to use the window
Descriptions about each field on the window, valid values, and related fields
Links to related topics, such as concepts and tasks related to the window